VOL-4836 - Cosmetic edits to trigger a sanity check build.

Makefile
--------
  o Replace inlined rm -fr calls with make builtin $(RM) -r.

pkg/events/common.go
pkg/flows/flow_utils_test.go
pkg/grpc/client.go
pkg/kafka/common.go
pkg/platform/platform_test.go
vendor/go.etcd.io/etcd/embed/etcd.go
vendor/github.com/coreos/etcd/client/doc.go
vendor/github.com/grpc-ecosystem/go-grpc-middleware/doc.go
vendor/github.com/prometheus/client_golang/prometheus/doc.go
------------------------------------------------------------
  o Update copyright notice in source to trigger a jenkins job.

Change-Id: Ib679a56436d141571082cf000acc5fefc3cd7c88
diff --git a/pkg/flows/flow_utils_test.go b/pkg/flows/flow_utils_test.go
index 4947c16..e1485cc 100644
--- a/pkg/flows/flow_utils_test.go
+++ b/pkg/flows/flow_utils_test.go
@@ -1,5 +1,5 @@
 /*
- * Copyright 2019-present Open Networking Foundation
+ * Copyright 2019-2022 Open Networking Foundation (ONF) and the ONF Contributors
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.